Sound-box for talking-machines.



J. G. ENGLISH.

SOUND BOX FOR TALKING MAUEINES.

AIILIUATION FILED MAY 16, 1906.

Patented Nov. 23, 1909.

5 n vanfo-a lcm . said flan e 1s cemented or otherwise fas- ITED STATES PATENT o FIo JOHN G. ENGLISH, or CAMDEN, NEW JERSEY, AssIGNoE '10 vIe'roE TALKING MAGHINE COMPANY, A oo PoEA'noN on NEW JERSEY.

souNn nox FOR 'rALKING-MAcHIN s.

Specification of Letters Patent.

atented Nov. 23, 1909.

Application filed. May 16, 1906. Serial No. 317,055.

To all whom it may concern:

Be it known that I, J OHN G. ENGLISH, a

citizen of the United States, and resident of the city of Camden, county of Camden,

State of New Jersey, have invented certain stylus bar, in which an adjustable tension is exerted upon the bar to restrain theoscillation thereof; and to provide other improvements as Wlll appear hereinafter.

In the drawing: Figure 1 is'an elevation of my sound box, showing a part of the casing and stylus bar mounting. mechanism in section; Fig. 2 is a sectional elevation thereof taken on lines 2 2 of Fig. 1; Fig. 3 is a bottom plan view of the sound box, showing a transverse section of the stylus bar mounting taken on line 33 of Fig. 2; Fig. 4 shows perspective views of .severalparts of the stylus bar mounting detached; and Fig. 5 is a sectional elevation of the sound box, showing a modified form of the stylus bar mounting.

The sound box. casing 1 may be of the usual open end construction, having an orifice 2 in the rear end thereof, to which the sound tube ma be co nected. The diaphra m 3 may but 1 ripheral portions are turned at ri ht angles to the face of the diaphragm to orm a cylindrical flange 4. The outer surface of the tened to t e inner wall of the sound box casing, so that the vibrations or fluctuations of the dia hragm .will take place only within the peripheral edge 5, and the diaphragm is so mountedthat it is tightly held within the wall of the sound box casing and has no moving contact surface. By reason of this construction, it will be observed that it is very easy to make a large number of sound boxes substantially identical in construction, at least to assemble thesound boxes so that the rear diaphragm is always at a predetermined distance from the rear wall of the of an well known type, prefer to employ one inwhich the pecase,'that is to say, fromthe wall whichhas a sound conveying opening 2 therein. The

flange 4: enables the workman to do this without any special care and at the same" time, the flange presents a simple means 'for attaching the diaphragm to the casing.

Attached to the diaphragm and passing through an orifice 1 in the .side of the easing is a stylus bar 6, the outer end of which is screw threaded at 7, the purpose of which screw threads will be hereinafter set forth. The lower end of the stylus bar 6 is enlarged as at 6 and is provided with a suitable socket within which the needle 8 is secured by a set screw 9, or by any other suitable means. Passing through the stylus bar and rigidly fastened to the same is the trunnion or axial pin 10. In theouter side of the .I

sound box casing and around the orifice through which thestylus bar passes is-a cylindrical recess 11,- within which the cylindrical cap 12 is located; The cap l2is of a box-like construction, having an orifice 12 in itslouter side, through which the'stylus bar passes, and which is large enough to permit the necessary amplitude of vibration of the said bar. On the'interior of said cap is an annular seat 13, having diametrical opposite grooves 14,'in-whijch rest the ends of the trunnion or axial pin 10. This seat-13 does not necessarily extend entirely 'a'round the interior of -the cap 12, as it is merely for the purpose of presenting surfaces in which the diametrical oppositely arranged grooves 14 may be locate The axial pin 10 is held within the grooves 14 by means of the spring '15. The spring may be formed of a circular blank stamped out to form the radially extending. blades 16, the outer ends of which are turned inwardly as shown at 17'. The central portion of the spring is a ertured and drawn outwardly Into a 'cy indrical collar 18, which surrounds the stylus bar, but is large enough to permit the necessary amplitude of vibration of the same. ,The inturned edges-1 7 of the sprin are located in depressions in the outer on of the cap, to prevent rotary movement of the spring. The spring is so constructedthat the central portion has'a-tendency to spring outwardly; that is, when the .said central portion is pressed inwardly toward the seat, it offers a yieldin resistance Located loosely around the sty us bar is the head 19, which is adapted to be moved inwardly against the spring by the nut 20. Thus, when the head is forced inwardly by means of the nut, the spring 15 resists said inwardmovement of the same, which resistance causes the stylus 'bar and its axial pin to be drawn outwardly,

thus exerting a yielding pressure on the bearing grooves 14.' p

The construction illustrated in Fig. 5 is the same as that of the remaining figures with the exception that a coil compression spring 22 surrounds the stylus bar and has bar. The inwardly depressed outer face of I the cap 12 enables the pressure of the spring orifice inthe same. fFurther, it is not essenon the stylus bar to be brought near to its axis of oscillation and renders the stylus bar free to respond to the vibrations impressed upon it while at the same time, the trunnions 10 are firmly held against their bearings in the cap 121 It is obvious that the outer end of the stylus beyond the nut 20 may have a downwardly projecting elbow therein, as it is sometimes required when the stylus extends over the edge of the sound box casing instead of projecting through the tial that the pressure against the bearings should be exerted in a plane passing through the longitudinal axis of the stylus, as the construction may be so modified as to have the pressure exerted in 'a plane transverse thereto.

' Other changes in the details and arrange ment of the various parts may be made Without departing from the spiritand scope of my invention, as pointed out in the appended claims.

What I claim as new and desire to pro-; t'ect by Letters Patent of the United States, 1s:-

1 In a sound reproducer, the combination with the diaphragm of a stylus bar mounted. to oscillate upon a pivotal bearing, compressed spring for tensioning said bearing, the axis of said spring being substantially in a plane of the axis of oscillation of said bar and substantially coincident with the longitudinal axis of the stylus bar at its bearing.

2. In a sound reproducer, the combination with the diaphragm of a stylus bar mounted to oscillate upon pivotal bearings and a compressed spring for tensioning said bearings,

' the longitudinal axis. of said spring being substantially coincident with the longitudinal axis of said bar, the said bar having a.

ture in the side thereof, a circular cap -fice, tl1e said circular cap projection against which one end of the spring bears to hold the pivots upon their bearings.

3. In a sound box for talking machines, a stylus bar, trunnions mounted on said sound box upon which said stylus bar oscillates, a springsurrounding said stylus bar close to said trunnions andexerting a yielding pressure between said trunnions and said sound box tending to force said bar outwardly from said bo 4. In a sound box for talking machines, a stylus bar, trunnions bearing against said sound box and upon which said stylus bar oscillates, a spring comprising a collar surroundin said stylus bar, radial arms engaging sai sound box, and means to exert a tension on said spring in the direction of the longitudinal axis of said stylus bar.

5. In a sound box for talking machines, a stylus bar, trunnions bearing against said sound box and upon which said stylus bar oscillates, a sprin comprising a collar surrounding said sty us bar, radial arms engaging said sound box, and means also-mounted on said stylus bar to exert a tension on said spring in the direction of the longitudinal axis of said stylus bar.

6. In asound recording and reproducing device, a sound box casing; a stylus bar extendingthrough an orifice in the side of said casing, "a hollow cylindrical cap having bearin surfaces therein and upon which the sa1d stylus bar is adapted to oscillate upon a transverse axis, a head attached to 100 said stylus beyond saidcap and a compression spring arranged between said cap and said head to hold the cap against the side of the casing and'the stylus bar upon its hearing surfaces.

7. In a sound recording and reproducing device, a sound box casing havingan a}peraving bearing seats therein covering sa1d orihaving an aper- 110 ture substantially in almement with the aperture in the casing, a stylus bar extending through said apertures and having a transverseaxial bearing, a head upon said stylus bar beyond said cap and a compres- 5 sion spring arranged between said head and said cap whereby the latter is held in engagement with the casing, and the axial bearing-of the-stylus is held under tension.

8. In a sound recording and reproducing 12o device, the combination with a sound box casing of a stylus bar, a cap having an orifice therein engaging the outer wal of said casing, bearing surfaces within said cap, means for mounting said) stylus bar upon 125 said bearingsurfaces, the said stylus bar ex tending through said orifice in the cap and the cap in engagement'with said casingand to hold the mounting means in engagement with the bearing surfaces.

9. In a sound box, a stylus bar, a mounting therefor restraining said bar to oscillate in a single plane, and a .compressed spring surrounding the said bar to hold the same upon the said mounting.

10. In a sound box, a stylusbar, a mounting therefor restraining said bar to oscillate in a single plane, and a compressed spring for tensioning said bar upon its mounting, the longitudinal axis, of said spring being normally substantially coin cident with the longitudinal axis of the said bar at the mounting. 1

11. In a sound box, a stylus bar, a mounting therefor, and a spring collar surrounding said stylus bar and having radial arms engaging the said sound box to hold the said stylus bar upon its mounting.

. 12. In a sound box, a stylus bar, a mounting therefor, and a spring collar surrounding said stylus bar and having radial arms engaging in grooves and provided therefor 1n the said sound box to hold the said stylus bar upon its mounting.

.13. In a sound box, a stylus bar, a mounting therefor, a spring collar surrounding said stylus bar,and ahead threaded upon said stylus bar and engaging said spring collar tocompress the same to hold the said rounding the said bar to old the same u on the said mounting, said bar being held in a fixed position longitudinally.

' 15. In a sound box, a stylus bar, a mountthe casing, of a stylus bar mounted thereon,

and means exerting pressure on said stylus bar tending to force said'bar longitudinally away from said sound box casing.

18. In a sound box,the combination with the casing, of a stylus bar, trunnions on said bar, bearings for said trunnions, and means I exerting pressure on said stylus bar to hold said trunnions in said bearings. and tending to force said bar longitudinally away from said sound box casing. p

19. In a sound box, the combination with the casing, having a sound conveying ope1'1- ing in the one wall thereof, of a diaphragm having means integral therewith engaging said wall, to determine the position of said diaphragm with-- respect to said wall and to retain ,the said diaphragm in position in said casing.

In Witness whereof, I have hereunto set my hand this 15th day of May, A. D. 1906.

J OHN C. ENGLISH.

Witnesses:

Cora A. WITMER, ALEXANDER PARK. 1 

